1078423921 has 2 divisors, whose sum is σ = 1078423922. Its totient is φ = 1078423920.

The previous prime is 1078423919. The next prime is 1078423967. The reversal of 1078423921 is 1293248701.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1008951696 + 69472225 = 31764^2 + 8335^2 .

It is a cyclic number.

It is not a de Polignac number, because 1078423921 - 2¹ = 1078423919 is a prime.

Together with 1078423919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1078423991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 539211960 + 539211961.

It is an arithmetic number, because the mean of its divisors is an integer number (539211961).

Almost surely, 2^1078423921 is an apocalyptic number.

It is an amenable number.

1078423921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1078423921 is an equidigital number, since it uses as much as digits as its factorization.

1078423921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 1078423921 is about 32839.3654171331. The cubic root of 1078423921 is about 1025.4862403692.

The spelling of 1078423921 in words is "one billion, seventy-eight million, four hundred twenty-three thousand, nine hundred twenty-one".